While mice are used for experimentation, one university killed tens of thousands of mice they had deemed unnecessary during the pandemic.

A recently publicized document from Rutgers’s financial department revealed that the university lost $1.15 million worth of “research animals required for student/postdoc training.” Recently leaked documentation from the Rutgers University finance department claims that as many as 23,000 mice meant for testing were euthanized in 2020. The mice were killed due to concerns about costs lost from the pandemic.